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diff --git a/OldMdePkg/Library/BaseLib/LShiftU64.c b/OldMdePkg/Library/BaseLib/LShiftU64.c
new file mode 100644
index 0000000000..50449eb9e3
--- /dev/null
+++ b/OldMdePkg/Library/BaseLib/LShiftU64.c
@@ -0,0 +1,41 @@
+/** @file
+  Math worker functions.
+
+  Copyright (c) 2006, Intel Corporation<BR>
+  All rights reserved. This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#include "BaseLibInternals.h"
+
+/**
+  Shifts a 64-bit integer left between 0 and 63 bits. The low bits are filled
+  with zeros. The shifted value is returned.
+
+  This function shifts the 64-bit value Operand to the left by Count bits. The
+  low Count bits are set to zero. The shifted value is returned.
+
+  If Count is greater than 63, then ASSERT().
+
+  @param  Operand The 64-bit operand to shift left.
+  @param  Count   The number of bits to shift left.
+
+  @return Operand << Count
+
+**/
+UINT64
+EFIAPI
+LShiftU64 (
+  IN      UINT64                    Operand,
+  IN      UINTN                     Count
+  )
+{
+  ASSERT (Count < sizeof (Operand) * 8);
+  return InternalMathLShiftU64 (Operand, Count);
+}